AngularJs service to manage login

oauth.js

//refer https://gist.github.com/kudchikarsk/f8ae377255f04cdc00a0fbc35287dbb5 for currentUser Service
(function (module) {

    var oauth = function () {

        var url = "/login";

        this.setUrl = function (newUrl) {
            url = newUrl;
        };

        this.$get = function ($http, formEncode, currentUser) {

            var processToken = function (username) {
                return function (response) {
                    currentUser.profile.username = username;
                    currentUser.profile.token = response.data.access_token;
                    currentUser.save();
                    return username;
                }
            };

            var login = function (username, password) {

                var configuration = {
                    headers: {
                        "Content-Type": "application/x-www-form-urlencoded"
                    }
                };

                var data = formEncode({
                    username: username,
                    password: password,
                    grant_type: "password"
                });

                return $http.post(url, data, configuration).then(processToken(username));
            };

            var logout = function() {
                currentUser.profile.username = "";
                currentUser.profile.token = "";
                currentUser.remove();
            };

            return {
                login: login,
                logout: logout
            };
        }
    };

    module.config(function ($provide) {
        $provide.provider("oauth", oauth);
    });

}(angular.module("common")));

//FormEncode service
(function(module) {

    var formEncode = function() {
        return function(data) {
            var pairs = [];
            for (var name in data) {
                pairs.push(encodeURIComponent(name) + '=' + encodeURIComponent(data[name]));
            }
            return pairs.join('&').replace(/%20/g, '+');
        };
    };

    module.factory("formEncode", formEncode);

}(angular.module("common")));